CCTV footage from a factory captured a humanoid robot suddenly going berserk, flailing its arms and trying to break free from a crane, startling nearby workers and knocking over equipment.

It’s unclear when or where it happened, but the incident sparked online jokes and concerns about robot behavior.

The video surfaced weeks after humanoid robots participated in a historic half-marathon in Beijing, where 21 bots ran alongside 12,000 humans—though a human ultimately won the race, the U.S. Sun has reported.

Written by B.C. Begley